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Respiration and Circulation

Maharashtra Board · Class 12 · Biology

Complete topic list for Respiration and Circulation in Maharashtra Board Class 12 Biology. Key concepts, sub-topics, and what to focus on for board exams.

44 questions25 flashcards5 concepts

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4 Topics · Maharashtra Board Class 12 Biology

Topics in Respiration and Circulation

1

1. Introduction to Respiration

  • Respiration is the biochemical process of oxidation of organic compounds for liberation of chemical energy in the form of ATP
  • Overall equation: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 38 ATP
  • Gaseous exchange occurs between organism and environment at respiratory surfaces
2

2. Human Respiratory System

  • Upper respiratory system: External nares, nasal cavities, internal nares, nasopharynx, nose, throat
  • Lower respiratory system: Larynx, trachea, bronchi, bronchioles, lungs
  • Nose structure: Vestibule (filtering), Respiratory part (conditioning), Olfactory chamber (smell detection)
3

3. Mechanism of Respiration

  • Four processes: A) Breathing, B) External respiration, C) Internal respiration, D) Cellular respiration
  • Breathing: Physical process involving inspiration and expiration
  • Inspiration: Active process - diaphragm flattens, intercostal muscles contract, thoracic volume increases
4

4. Transport of Respiratory Gases

  • Oxygen transport: 97% as oxyhemoglobin (HbO₂), 3% dissolved in plasma
  • Hemoglobin equation: Hb + 4O₂ ⇌ Hb(4O₂)
  • Oxygen-hemoglobin dissociation curve: Sigmoid curve showing Hb saturation vs pO₂

Key Concepts

Respiration is the biochemical processThe system consists of upper respiratoryBreathing involves inspiration (active process)Oxygen transportBlood consists of plasma (55%)

Frequently Asked Questions

What are the important topics in Respiration and Circulation for Maharashtra Board Class 12 Biology?
Respiration and Circulation covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Respiration and Circulation — Maharashtra Board Class 12 Biology?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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